The hotel stay is getting a makeover. The growing wave of style-conscious Generation Xers — 60 million Americans ages 24 to 40 - is forcing hotels across the USA to revamp lobby layouts, menu offerings and front-desk clerks' attire. Some chains are launching new hotel brands designed for the under-40 set. And even stuffy hotel speak — "It's my pleasure, sir" — is going the way of the polyester floral bedspread as the industry adjusts to the habits and values of younger, hipper travelers.